<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2006-02-28</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001235468</issuerCik>
        <issuerName>LIQUIDITY SERVICES INC</issuerName>
        <issuerTradingSymbol>LQDT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001119967</rptOwnerCik>
            <rptOwnerName>ABS CAPITAL PARTNERS IV LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>400 EAST PRATT STREET</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 910</rptOwnerStreet2>
            <rptOwnerCity>BALTIMORE</rptOwnerCity>
            <rptOwnerState>MD</rptOwnerState>
            <rptOwnerZipCode>21202-3116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001126337</rptOwnerCik>
            <rptOwnerName>ABS CAPITAL PARTNERS IV A LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>400 EAST PRATT STREET</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 910</rptOwnerStreet2>
            <rptOwnerCity>BALTIMORE</rptOwnerCity>
            <rptOwnerState>MD</rptOwnerState>
            <rptOwnerZipCode>21202-3116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001207736</rptOwnerCik>
            <rptOwnerName>ABS CAPITAL PARTNERS IV SPECIAL OFFSHORE LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>400 EAST PRATT STREET</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 910</rptOwnerStreet2>
            <rptOwnerCity>BALTIMORE</rptOwnerCity>
            <rptOwnerState>MD</rptOwnerState>
            <rptOwnerZipCode>21202-3116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001207737</rptOwnerCik>
            <rptOwnerName>ABS CAPITAL PARTNERS IV OFFSHORE LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>400 EAST PRATT STREET</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 910</rptOwnerStreet2>
            <rptOwnerCity>BALTIMORE</rptOwnerCity>
            <rptOwnerState>MD</rptOwnerState>
            <rptOwnerZipCode>21202-3116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2006-02-28</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>3262643</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3262643</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F3"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Series C preferred stock</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0</value>
                <footnoteId id="F2"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2006-02-28</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>C</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>3262643</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                    <footnoteId id="F2"/>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>common stock</value>
                    <footnoteId id="F2"/>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>3262643</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3262643</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F3"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">The shares are owned directly by ABS Capital Partners IV, L.P. (&quot;ABS Capital Partners IV&quot;) in the amount of 2,887,105 shares, ABS Capital Partners IV-A, L.P. (&quot;ABS Capital Partners IV-A&quot;) in the amount of 96,664 shares, ABS Capital Partners IV Offshore, L.P. (&quot;ABS Capital Partners IV Offshore&quot;) in the amount of 165,817, ABS Capital Partners IV Special Offshore, L.P. (&quot;ABS Capital Partners IV Special Offshore,&quot; and together with ABS Capital Partners IV, ABS Capital Partners IV-A, ABS Capital Partners IV Offshore, &quot;The Funds&quot; in the amount of 113,057 shares).  ABS Partners IV, L.L.C., as the general partner of the Funds (the &quot;General Partner&quot;), and Donald B. Hebb, Jr., Timothy T. Weglicki, John D. Stobo, Jr., Phillip A. Clough, Frederic G. Emry, Ashoke Goswami,  Ralph S. Terkowitz, and Laura L. Witt, as the managers of the General Partner (the &quot;Managers&quot;), are indirect beneficial owners of the reported securities.</footnote>
        <footnote id="F2">The Series C preferred stock is automatically converted on a 1-for-1 basis into Liquidity Services, Inc, (&quot;LSI&quot;) common stock, upon the closing of the initial public offering.</footnote>
        <footnote id="F3">The General Partner and each of the Managers disclaims beneficial ownership of these shares except to the extent of their respective pecuniary interest therein. ABS Partners IV, LLC is the general partner of these entities and has voting and dispositive power over these shares.</footnote>
    </footnotes>

    <remarks>This filing constitutes one of three related filings by the following joint reporting persons with respect to the securities of the issuer set forth hereon: ABS Capital Partners IV LP, ABS Capital Partners IV-A LP, ABS Capital Partners IV Special Offshore LP, ABS Capital Partners IV Offshore LP, ABS Partner IV LLC, Donald B. Hebb Jr., Phillip A. Clough, John D. Stobo Jr., Frederic G. Emry III.,Ashoke Goswami, Laura L. Witt, Timothy T. Weglicki, and Ralph S. Terkowitz.</remarks>

    <ownerSignature>
        <signatureName>/s/ Donald B. Hebb, Managing Member of ABS Partners IV, L.L.C. the General Partner of ABS Capital Partners IV, L.P.</signatureName>
        <signatureDate>2006-02-28</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Donald B. Hebb, Managing Member of ABS Partners IV, L.L.C. the General Partner of ABS Capital Partners IV-A, L.P.</signatureName>
        <signatureDate>2006-02-28</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Donald B. Hebb, Managing Member of ABS Partners IV, L.L.C. the General Partner of ABS Capital Partners IV Offshore, L.P.</signatureName>
        <signatureDate>2006-02-28</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Donald B. Hebb, Managing Member of ABS Partners IV, L.L.C. the General Partner of ABS Capital Partners IV Special Offshore, L.P.</signatureName>
        <signatureDate>2006-02-28</signatureDate>
    </ownerSignature>
</ownershipDocument>
